I can offer some insight as to building your own oven can be like. I have 2 of them myself, one is 4' deep 2'6" tall and about 2' wide. Two elements, basic house oven elements, and to answer whoevers question it was, YES you can wire them up so both are on at same time. If you look at the wiring for a house oven, you have a 3 or 4 wire system, 2 hots and 2 grounds (4 wire), 1 ground (3 wire). The two hot wires are both 110v a piece, they are combined in your oven controller to divy (sp?) the power to where it needs to go. The top element is 110v the bottom 240v. Wiring them up together so far has not been a prob, so far! lol There is also a fan mounted in this oven, now let me say something here. I am CHEAP!!! If someone else did something or made it, so can I! I will build it before I buy it, don't think making a 100kv adjustable Pc gun hasn't crossed my mind and drawings. There is the theory again, someone built it, so can I! Commonsense has kept me from shocking myself to death. Anyways, like Non-stick said, if you are really not going to need the big oven on a daily basis, it does take a lot of space and money and time to make one. I have another that is not quite complete yet, 8' tall 4x4 wide and deep. It has been a on going project, and it is HEAVY, about 1400 pounds right now. No wiring, no fans, no electronics in it yet. You need help building something like this, and the tools to do it with. I have every tool known to man and it takes time to do it right, and safely. I have a IR light, but for my usage it is not something I need to use to do my job, I am much to busy to not have a large oven to do my parts. But when I did this stuff for fun and just my own parts, it was great. I put it away when I was done, and my shop was much bigger. Now you walk into my shop wearing full armor, and still run into stuff and hurt yourself. So there are ups and downs. Also the fan need to be intrinsically safe, they cost $$$$$. There are ways around them, but as I said, they take time to make and some thought involved. Either way have fun.
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